This week’s selection for The Gaggle Music Club is Mozart’s Symphony No. 41 in C major, K. 551 (“Jupiter”).

Mozart composed this symphony--without doubt one of Western music's greatest musical achievements--in the summer of 1788. It represents not only the culmination of his symphonic output; it is also a distillation of his intellectual and emotional state during one of the most difficult periods of his life.

From June to August 1788, Mozart composed three symphonies in astonishing succession: No. 39 in E-flat major, K. 543 (completed June 26); No. 40 in G minor, K. 550 (completed July 25); and No. 41 in C major, K. 551 (completed Aug. 10).

He wrote them during one of the darkest times of his life--professionally, financially and psychologically. The Viennese public had lost much of its appetite for large orchestral concerts, and Mozart’s popularity was waning. Concertgoers had become enamored of lightweight composers such as Carl Ditters von Dittersdorf and Leopold Koželuch. In addition, The Austro-Turkish War (1788–1791), conducted by Emperor Joseph II, had drained the economy and diverted aristocratic attention away from the arts.

Mozart’s finances were dire: He had moved from central Vienna to the cheaper suburb of Alsergrund and was writing desperate letters begging his fellow Freemason and friend Michael Puchberg for loans. Also, his infant daughter Theresia died in June, while his wife, Constanze, was suffered from ill-health. Mozart was frequently alone and despondent. His letters to Puchberg from July 1788 are painful reading: “If you only knew how I am forced to live — without money, without credit, without the slightest enjoyment of life… my mind and my heart are so disquieted that I can scarcely compose.”

It is all the more extraordinary therefore that out of so much sadness and despair should have emerged a work of such outstanding cosmic joy.

Scholars have long debated why Mozart wrote those three final symphonies at all. There is no surviving commission or record of a specific performance. The three symphonies form a triptych, often seen as a single grand statement — moving from E-flat (serenity and nobility) to G minor (tragedy and turbulence) to C major (radiant affirmation).

The nickname “Jupiter” was not Mozart’s — it appeared decades later, and was probably first used by the London impresario Johann Peter Salomon (who had managed Haydn’s visits to England) around 1820. The name stuck because it perfectly captured the symphony’s heroic, Olympian grandeur — the blaze of C major trumpets, the complex polyphony and the monumental final movement.

In Roman mythology, Jupiter is the king of the gods, ruler of light and order. The symphony’s final C-major blaze is often interpreted as a musical image of divine clarity, a vision of reason triumphant over chaos.

During his later years, Mozart had become increasingly fascinated by Baroque contrapuntal studies, particularly those of of J.S. Bach and George Frideric Handel, whose music he discovered through the patron Baron van Swieten. The Jupiter Symphony is the crowning result of that study. It fuses Baroque polyphony with classical form and clarity. The final movement, a magnificent five-voice fugato built from four interrelated themes, achieves something unprecedented in symphonic writing up to that time. This synthesis embodied the Enlightenment ideal of reason united with beauty, and it would profoundly influence Beethoven and the entire 19th-century symphonic tradition.

It is not known whether Mozart ever heard the Jupiter Symphony performed in his lifetime. It may have been played in a private setting, or he may have written it simply for posterity. The first documented public performance was in Vienna in 1791, the year of his death, or perhaps shortly thereafter. By the 19th century, it had become the emblem of Classical perfection — praised by Haydn and admired by Beethoven.

The finale of the Jupiter Symphony (Molto allegro, C major) is one of the most dazzling achievements in all Western music. What Mozart does here is not just craft a brilliant ending — he unites reason, beauty and sheer joy in a single act of contrapuntal perfection. Mozart fuses fugal counterpoint (inherited from Bach and Handel) with classical sonata architecture (developed by Haydn). In the movement, Mozart introduces five distinct motifs and then, in the coda, combines all of them in a contrapuntal tour de force.

The final bars are a vision of the universe functioning as one — multiplicity resolved in harmony.

In this performance from 2012, the Orquesta Sinfónica de Galicia is conducted by Lorin Maazel.